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The Exact WKB and the Landau-Zener transition for asymmetry in cosmological particle production

Cosmological particle production by a time-dependent scalar field is common in cosmology. We focus on the mechanism of asymmetry production when interaction explicitly violates symmetry and its motion is rapid enough to create particles by itself. Combining the exact WKB analysis and the Landau-Zener transition, we point out that perturbation before the non-perturbative analysis may drastically change the structure of the Stokes lines of the theory. The Exact WKB can play an important role in avoiding such discrepancies.

preprint2022arXivOpen access
Seishi EnomotoTomohiro Matsuda
astro-ph.COhep-phhep-th
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Seishi EnomotoTomohiro Matsuda

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